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A chirp-controlled nanosecond-pulsed tunable optical parametric oscillator and two-stage Ti:sapphire amplifier generate high-power coherent light at ~840 nm, with frequency stability and narrow optical bandwidth as needed for high-resolution ultraviolet spectroscopy.
We use nonlinear optical processes to generate narrowband light from an optical parametric oscillator, yielding significantly improved frequency stability compared with dye lasers where the chirp arises principally from population inversion. We measure chirp using optical heterodyne detection and minimise it by phase matching, producing a near Fourier-transform limited bandwidth.
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